org.apache.commons.collections4.functors
Class NullPredicate<T>

java.lang.Object
  extended by org.apache.commons.collections4.functors.NullPredicate<T>
All Implemented Interfaces:
Serializable, Predicate<T>

public final class NullPredicate<T>
extends Object
implements Predicate<T>, Serializable

Predicate implementation that returns true if the input is null.

Since:
3.0
Version:
$Id: NullPredicate.java 1469004 2013-04-17 17:37:03Z tn $
See Also:
Serialized Form

Field Summary
static Predicate<?> INSTANCE
          Singleton predicate instance
 
Method Summary
 boolean evaluate(T object)
          Evaluates the predicate returning true if the input is null.
static
<T> Predicate<T>
nullPredicate()
          Factory returning the singleton instance.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

INSTANCE

public static final Predicate<?> INSTANCE
Singleton predicate instance

Method Detail

nullPredicate

public static <T> Predicate<T> nullPredicate()
Factory returning the singleton instance.

Type Parameters:
T - the type that the predicate queries
Returns:
the singleton instance
Since:
3.1

evaluate

public boolean evaluate(T object)
Evaluates the predicate returning true if the input is null.

Specified by:
evaluate in interface Predicate<T>
Parameters:
object - the input object
Returns:
true if input is null


Copyright © 2001–2013 The Apache Software Foundation. All rights reserved.